<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>权限管理</el-breadcrumb-item>
			<el-breadcrumb-item>角色列表</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 添加角色按钮 -->
			<el-row>
				<el-col>
					<el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
				</el-col>
			</el-row>
			<!-- 列表区域 -->
			<el-table :data="rolesList" border stripe>
				<!-- 展开列 -->
				<el-table-column type="expand">
					<template slot-scope="scope">
						<el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
							<!-- 渲染一级权限 -->
							<el-col :span="5">
								<el-tag closable @close="removeRightsById(scope.row, item1.id)">{{item1.authName}}</el-tag>
								<i class="el-icon-caret-right"></i>
							</el-col>
							<!-- 渲染二级和三级权限 -->
							<el-col :span="19">
								<el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
									<!-- 通过 for 循环， 嵌套渲染二级权限 -->
									<el-col :span="6">
										<el-tag closable @close="removeRightsById(scope.row, item2.id)" type="success">{{item2.authName}}</el-tag>
										<i class="el-icon-caret-right"></i>
									</el-col>
									<el-col :span="18">
										<!-- 通过 for 循环，嵌套渲染三级权限 -->
										<el-tag type="warning" v-for="(item3, i3) in item2.children" :key="item3.id" closable @close="removeRightsById(scope.row, item3.id)">{{item3.authName}}</el-tag>
									</el-col>
								</el-row>
							</el-col>
						</el-row>
						<!-- <pre>{{scope.row}}</pre> -->
					</template>
				</el-table-column>
				<!-- 索引列 -->
				<el-table-column type="index" label="#"></el-table-column>
				<el-table-column label="角色名称" prop="roleName"></el-table-column>
				<el-table-column label="角色描述" prop="roleDesc"></el-table-column>
				<el-table-column label="操作" width="300">
					<template slot-scope="scope">
						<!-- 编辑按钮 -->
						<el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)">编辑</el-button>
						<!-- 删除按钮 -->
						<el-button type="danger" icon="el-icon-delete" size="mini" @click="removeRoleById(scope.row.id)">删除</el-button>
						<!-- 分配权限按钮 -->
						<el-button type="warning" icon="el-icon-setting" size="mini" @click="showAllotRightsDialog(scope.row)">分配权限</el-button>
					</template>
				</el-table-column>
			</el-table>
		</el-card>

		<!-- 添加角色对话框区域 -->
		<el-dialog title="添加角色" :visible.sync="addDialogVisible" width="50%" @close="addRoleDialogClose">
			<el-form :model="addRoleFrom" :rules="addRoleFromRules" ref="addRoleFromRef" label-width="80px">
				<el-form-item label="角色名称" prop="roleName">
					<el-input v-model="addRoleFrom.roleName"></el-input>
				</el-form-item>
				<el-form-item label="角色描述" prop="roleDesc">
					<el-input v-model="addRoleFrom.roleDesc"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addRole">确 定</el-button>
			</span>
		</el-dialog>

		<!-- 编辑角色的对话框 -->
		<el-dialog title="修改角色信息" :visible.sync="editDialogVisible" width="50%" @close="editRoleDialogClose">
			<el-form :model="editRoleFrom" :rules="editRoleFromRules" ref="editRoleFromRef" label-width="80px">
				<el-form-item label="角色名称" prop="roleName">
					<el-input v-model="editRoleFrom.roleName"></el-input>
				</el-form-item>
				<el-form-item label="角色描述" prop="roleDesc">
					<el-input v-model="editRoleFrom.roleDesc"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editRole">确 定</el-button>
			</span>
		</el-dialog>

		<!-- 分配权限的对话框区域 -->
		<el-dialog title="分配权限" :visible.sync="allotRightsDialogVisible" width="50%">
			<!-- 树形控件 -->
			<el-tree :data="rightsTree" :props="treeProps" ref="treeRef" show-checkbox default-expand-all node-key="id" :default-checked-keys="defKeys"></el-tree>
			<span slot="footer" class="dialog-footer">
				<el-button @click="allotRightsDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="allotRights">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
  data() {
    return {
      // 角色列表
      rolesList: [],
      // 控制添加角色对话框的显示与隐藏
      addDialogVisible: false,
      // 添加角色的表单数据
      addRoleFrom: {
        roleName: '',
        roleDesc: ''
      },
      // 添加角色表单的验证规则
      addRoleFromRules: {
        roleName: [{ required: true, message: '请输入角色名称', trigger: 'blur' }],
        roleDesc: [{ required: true, message: '请输入角色描述', trigger: 'blur' }]
      },
      // 控制编辑角色对话框的展示与隐藏
      editDialogVisible: false,
      // 编辑角色的表单数据
      editRoleFrom: {
        roleName: '',
        roleDesc: ''
      },
      // 编辑角色表单的验证规则
      editRoleFromRules: {
        roleName: [{ required: true, message: '请输入角色名称', trigger: 'blur' }],
        roleDesc: [{ required: true, message: '请输入角色描述', trigger: 'blur' }]
      },
      // 控制分配权限对话框的展示与隐藏
      allotRightsDialogVisible: false,
      // 获取到的所有权限数据
      rightsTree: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中（叶子）节点的 id 值数组
      defKeys: [],
      // 当前即将被分配权限的角色id
      roleId: ''
    }
  },
  created() {
    // 获取所有角色数据
    this.getRolesList()
  },
  methods: {
    // 获取所有角色数据
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) return this.$message.error('获取角色列表失败！')
      this.rolesList = res.data
      // console.log(this.rolesList)
    },
    // 根据 id 移除当前角色指定的权限
    async removeRightsById(role, rightsId) {
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult === 'cancel') return this.$message.info('已取消删除！')
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightsId}`)
      if (res.meta.status !== 200) return this.$message.error('删除权限失败！')
      // 修改形参。反向影响
      role.children = res.data
      this.$message.success('删除权限成功！')
    },
    // 添加角色
    addRole() {
      this.$refs.addRoleFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('roles', this.addRoleFrom)
        // console.log(res)
        if (res.meta.status !== 201) return this.$message.error('添加角色失败！')
        this.addDialogVisible = false
        this.getRolesList()
        this.$message.success('添加角色成功！')
      })
    },
    // 监听添加角色对话框的关闭事件
    addRoleDialogClose() {
      this.$refs.addRoleFromRef.resetFields()
    },
    // 监听编辑角色对话框的关闭事件
    editRoleDialogClose() {
      this.$refs.editRoleFromRef.resetFields()
    },
    // 根据 id 查询对应的角色
    async showEditDialog(role) {
      const { data: res } = await this.$http.get('roles/' + role.id)
      if (res.meta.status !== 200) return this.$message.error('获取角色失败！')
      this.editRoleFrom = res.data
      this.editDialogVisible = true
    },
    // 编辑修改角色信息并提交
    editRole() {
      this.$refs.editRoleFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`roles/${this.editRoleFrom.roleId}`, this.editRoleFrom)
        if (res.meta.status !== 200) return this.$message.error('更新角色失败！')
        this.editDialogVisible = false
        this.getRolesList()
        this.$message.success('更新角色成功！')
      })
    },
    // 根据 id 删除对应的角色
    async removeRoleById(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult === 'cancel') return this.$message.info('已取消删除！')
      const { data: res } = await this.$http.delete('roles/' + id)
      if (res.meta.status !== 200) return this.$message.error('删除角色失败！')
      this.getRolesList()
      this.$message.success('删除角色成功！')
    },
    // 展示分配权限对话框
    async showAllotRightsDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error('获取权限数据失败！')
      this.rightsTree = res.data
      // 点击分配权限按钮时，清空 defKeys 数组
      this.defKeys = []
      this.getLeafKeys(role, this.defKeys)
      this.allotRightsDialogVisible = true
    },
    // 根据递归的形式，获取角色下所有的三级权限的 id ,并保存到 defkeys 数组中
    getLeafKeys(node, arr) {
      // 如果 node 节点中不包含 children, 则为三级节点
      if (!node.children) return arr.push(node.id)
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 点击确定分配权限
    async allotRights() {
      // 所有选中(叶子)节点和半选中节点的key(即节点对应的id值)组成的数组
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error('更新权限失败！')
      this.allotRightsDialogVisible = false
      this.getRolesList()
      this.$message.success('更新权限成功！')
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
	margin: 10px;
}
.bdtop {
	border-top: 1px solid #efefef;
}
.bdbottom {
	border-bottom: 1px solid #efefef;
}
.vcenter {
	display: flex;
	align-items: center;
}
</style>
